Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire;

FIG. 2 is a front view thereof;

FIG. 3 is a plane view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a fragmentary enlarged view showing the details of the tread portion thereof;

FIG. 6 is an end view taken along line 6-6 in FIG. 5; and,

FIG. 7 is an end view taken along line 7-7 in FIG. 5.

Broken lines in the drawing figures are intended to show unclaimed portions of the tire and tread, and thus form no part of the claimed design. 

The ornamental design for a tread portion of an automobile tire, as shown and described. 